Hybrid Public Key Encryption (HPKE)

Registries included below

HPKE KEM Identifiers

Registration Procedure(s)

Specification Required

Expert(s)

Christopher Wood, Richard Barnes

Reference

[RFC9180]

Request an Assignment

[https://www.iana.org/form/protocol-assignment]

Available Formats

CSV

Value	KEM	Nsecret	Nenc	Npk	Nsk	Auth	Reference
0x0000	Reserved	N/A	N/A	N/A	N/A	yes	[RFC9180]
0x0001-0x000F	Unassigned
0x0010	DHKEM(P-256, HKDF-SHA256)	32	65	65	32	yes	[NISTCurves][RFC5869]
0x0011	DHKEM(P-384, HKDF-SHA384)	48	97	97	48	yes	[NISTCurves][RFC5869]
0x0012	DHKEM(P-521, HKDF-SHA512)	64	133	133	66	yes	[NISTCurves][RFC5869]
0x0013	DHKEM(CP-256, HKDF-SHA256)	32	32	32	32	Yes	[NISTCurves][RFC6090][draft-irtf-cfrg-dnhpke-01]
0x0014	DHKEM(CP-384, HKDF-SHA384)	48	48	48	48	Yes	[NISTCurves][RFC6090][draft-irtf-cfrg-dnhpke-01]
0x0015	DHKEM(CP-521, HKDF-SHA512)	64	66	66	66	Yes	[NISTCurves][RFC6090][draft-irtf-cfrg-dnhpke-01]
0x0016	DHKEM(secp256k1, HKDF-SHA256)	32	65	65	32	yes	[Standards for Efficient Cryptography 2 (SEC 2)][draft-wahby-cfrg-hpke-kem-secp256k1-01]
0x0017-0x001F	Unassigned
0x0020	DHKEM(X25519, HKDF-SHA256)	32	32	32	32	yes	[RFC5869][RFC7748]
0x0021	DHKEM(X448, HKDF-SHA512)	64	56	56	56	yes	[RFC5869][RFC7748]
0x0022-0x002F	Unassigned
0x0030	X25519Kyber768Draft00	64	1120	1216	2432	no	[draft-westerbaan-cfrg-hpke-xyber768d00-02]
0x0031-0x0039	Unassigned
0x0040	ML-KEM-512	32	768	800	64	no	[draft-connolly-cfrg-hpke-mlkem-04]
0x0041	ML-KEM-768	32	1088	1184	64	no	[draft-connolly-cfrg-hpke-mlkem-04]
0x0042	ML-KEM-1024	32	1568	1568	64	no	[draft-connolly-cfrg-hpke-mlkem-04]
0x0043-0x6479	Unassigned
0x647a	X-Wing	32	1120	1216	32	no	[draft-connolly-cfrg-xwing-kem-06]
0x647b-0xFFFF	Unassigned

Registration Procedure(s)

Specification Required

Expert(s)

Christopher Wood, Richard Barnes

Reference

[RFC9180]

Request an Assignment

[https://www.iana.org/form/protocol-assignment]

Available Formats

CSV

Value	KDF	Nh	Reference
0x0000	Reserved	N/A	[RFC9180]
0x0001	HKDF-SHA256	32	[RFC5869]
0x0002	HKDF-SHA384	48	[RFC5869]
0x0003	HKDF-SHA512	64	[RFC5869]
0x0004-0xFFFF	Unassigned

Registration Procedure(s)

Specification Required

Expert(s)

Christopher Wood, Richard Barnes

Reference

[RFC9180]

Request an Assignment

[https://www.iana.org/form/protocol-assignment]

Available Formats

CSV

Value	AEAD	Nk	Nn	Nt	Reference
0x0000	Reserved	N/A	N/A	N/A	[RFC9180]
0x0001	AES-128-GCM	16	12	16	[GCM]
0x0002	AES-256-GCM	32	12	16	[GCM]
0x0003	ChaCha20Poly1305	32	12	16	[RFC8439]
0x0004-0xFFFE	Unassigned
0xFFFF	Export-only	N/A	N/A	N/A	[RFC9180]